On May 30, Sarah Murnaghan celebrated her 100th day in Children's Hospital of Philadelphia with her father, Fran, and mother, Janet. / Murnaghan family via AP

by Cathy Payne, USA TODAY

by Cathy Payne, USA TODAY

A 10-year-old Pennsylvania girl who had a second lung transplant came out of surgery shortly after 5 p.m. today.

Sarah Murnaghan, who has cystic fibrosis, had a procedure to repair her diaphragm, which was partially paralyzed in the last transplant, and required a breathing tube.

The latest procedure took place at Children's Hospital of Philadelphia. The surgery, called diaphragm plication, took about two hours, according to a post on the Facebook page of her mother, Janet Murnaghan. She wrote, "She is out of surgery, not awake yet, but Drs. say it went well."

On Monday, her mother wrote on her Facebook page: "Sarah is doing well, alert, improving inch by inch. We are hopeful tomorrow's surgery will bring us closer to successful extubation," in which doctors remove the breathing tube.

Stephen Shew, associate professor of pediatric surgery at Mattel Children's Hospital UCLA, said the diaphragm is a thin muscle that separates the abdominal and chest cavities.

Diaphragm plication, which is major surgery, is a folding of the diaphragm, said Shew, who has not treated Sarah. It allows more volume inside the chest cavity for the lungs to be able to accept air and work more effectively, he added.

In general, complications can include bleeding, infection, injury to the surrounding structures like organs, and unfolding of the diaphragm, Shew said.

The family announced Friday that the girl received a second set of adult lungs after the first failed just hours after the transplant June 12. The second transplant, which took place on June 15, appeared to be successful. The girl took a few breaths on her own, but she was put back on the ventilator because of the diaphragmatic paralysis.